The problem is when you use your "copy" as inspiration and actually create and publish something. It is very hard to be certain you are safe, besides literal expression close paraphrasing is also infringing, using world building elements, or using any original abstraction (AFC test). You can only know after a lawsuit.

It is impossible to tell how much AI any creator used secretly, so now all works are under suspicion. If copyright maximalists successfully copyright style (vibes), then creativity will be threatened. If they don't succeed, then copyright protection will be meaningless. A catch 22.